The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double-slit experiment is

The maximum number of possible interference maxima when slit separation is equal to 4 times the wavelength of light used in a double slit experiment is

The ratio of the intensities at minima to maxima in the interference pattern is 9 : 25. What will be the ratio of the widths of the two slits in the young's double slit experiment ?

The ratio of the intensities at minima to maxima in the interference pattern is 9 : 25. What will be the ratio of the widths of the two slits in the young's double slit experiment ?

In a Young's double slit experiment if the slit separation is twice the wavelength of light used then the maximum number of interference maxima is